a polygon
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A Square has 4 sides, the shape you want that has twice as many sides as this is called a Octagon. ( Oct = 8 - as in Octopus ).
A 2-dimensional shape of many sides, such as hexagon, pentagon, and octagone, is called a polygon
A shape with ten sides is called a decagon
A shape with three sides is called a triangle.
It is an IRREGULAR shape.